The term used to define the only heterosexual male or female in a gay bar or club, and often pulls the only other 'Needle in a Gaystack' of the opposite sex. Usually forced by their gay or lesbian friend(s) or often the overconfident 'straight guy' from work who persistently professes how comfortable he is with his sexuality/how metrosexual he is.

Hetero: "I don't know whether I'll come to G-A-Y with you on Friday, it'll be full of gay people."
Homo: "Straight people always pull in there, even if it is like finding a Needle in a Gaystack."